Supply Basin Reservoir Report

Last Updated: December 5, 2025

Supply Basin in Colorado is a state-regulated earth dam completed in 1911 for recreational purposes.


°F

°F

mph

Wind

%

Humidity

Summary

Located in Garfield County near Glenwood Springs, this dam on Deep Creek stands at 13 feet high with a hydraulic height of 7 feet. With a storage capacity of 267 acre-feet, Supply Basin covers a surface area of 22 acres and has a maximum discharge of 1600 cubic feet per second.

Despite its low hazard potential, the dam's condition was assessed as fair during the last inspection in July 2019. With a moderate risk assessment score, Supply Basin has an inspection frequency of 6 times per year. The dam features an uncontrolled spillway with a width of 15 feet, and its primary purpose of recreation underscores its importance as a water resource and climate asset in the region. Enthusiasts of water resources and climate issues will find Supply Basin an intriguing structure to study and monitor for its impact on the local environment.

Year Completed

1911

Dam Length

140

Dam Height

13

River Or Stream

DEEP CREEK

Primary Dam Type

Earth

Surface Area

22

Hydraulic Height

7

Nid Storage

267

Structural Height

13

Hazard Potential

Low

Nid Height

13
       
Seasonal Comparison

Weather Forecast

Dam Data Reference

Condition Assessment

Satisfactory
No existing or potential dam safety deficiencies are recognized. Acceptable performance is expected under all loading conditions (static, hydrologic, seismic) in accordance with the minimum applicable state or federal regulatory criteria or tolerable risk guidelines.
Fair
No existing dam safety deficiencies are recognized for normal operating conditions. Rare or extreme hydrologic and/or seismic events may result in a dam safety deficiency. Risk may be in the range to take further action. Note: Rare or extreme event is defined by the regulatory agency based on their minimum
Poor A dam safety deficiency is recognized for normal operating conditions which may realistically occur. Remedial action is necessary. POOR may also be used when uncertainties exist as to critical analysis parameters which identify a potential dam safety deficiency. Investigations and studies are necessary.
Unsatisfactory
A dam safety deficiency is recognized that requires immediate or emergency remedial action for problem resolution.
Not Rated
The dam has not been inspected, is not under state or federal jurisdiction, or has been inspected but, for whatever reason, has not been rated.
Not Available
Dams for which the condition assessment is restricted to approved government users.

Hazard Potential Classification

High
Dams assigned the high hazard potential classification are those where failure or mis-operation will probably cause loss of human life.
Significant
Dams assigned the significant hazard potential classification are those dams where failure or mis-operation results in no probable loss of human life but can cause economic loss, environment damage, disruption of lifeline facilities, or impact other concerns. Significant hazard potential classification dams are often located in predominantly rural or agricultural areas but could be in areas with population and significant infrastructure.
Low
Dams assigned the low hazard potential classification are those where failure or mis-operation results in no probable loss of human life and low economic and/or environmental losses. Losses are principally limited to the owner's property.
Undetermined
Dams for which a downstream hazard potential has not been designated or is not provided.
Not Available
Dams for which the downstream hazard potential is restricted to approved government users.